ISIS appears to execute British aid worker David Haines

September 13, 2014 10:42 PM

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(CNN) -- British aid worker David Haines appears to have been executed by ISIS militants, according to a video posted Saturday to a website associated with the group, making him the third Western captive to be killed by the Islamist extremist group in recent weeks.

The ISIS video post showing Haines' apparent beheading called his execution "a message to the allies of America."